BBC WEATHER has forecast sizzling temperatures to return to the country sparking “torrential” downpours and thundery conditions for parts of the UK this week.

BBC weather has claimed temperatures in the UK are “on the up again” after thermometers dipped on Tuesday.

Forecaster Helen Willetts said the rising heat could be halted for some parts of the country as “downpours” hit over the coming days.

She said: “Even though we will have that showery rain in the north, for many of us in the south we are losing that fresh breeze that we have had on Tuesday. Instead, it looks as if temperatures are on the up again.

“Different day for Northern Ireland, first appreciable rain potentially for three weeks. Still some rain across the west and north of Scotland, but drier further east towards the borders.

“Lots of dry and sunny weather for England and Wales. Perhaps a few sharp showers sparked by the heat into the Pennines and the Peak District into Wales and thesouth-west.

“Thursday sees the greatest risk of a few showers developing in Wales and the western side of England. Some remanence of a weather front just giving that moisture and that heat starting to build as well.

“So getting warmer by day, getting warmer by night and getting a little bit more uncomfortable for sleeping again.

“Back up into the low 20C’s, parts of Scotland and Northern Ireland. Into the high20C’sfor England and Wales. Higher still potentially on Friday and therefore a greater risk of more showers around.

Getting warmer by day, getting warmer by night and getting a little bit more uncomfortable for sleeping again

BBC weather forecaster Helen Willetts

“This time obviously the energy is there in the atmosphere to give some big downpours, with the heat building they could be quite torrential, with some thunder as well to go with them.

“So I think as the heat is returning throughout the week, there is a greater risk, at least until the end of the working week of a few more showers.”

The Met Office weather forecast also warns of temperatures “turning hotter again” with “heavy thundery showers” on the way.

The forecast for Thursday to Saturday reads: “Turning hotter again with sunny spells and scattered heavy and thundery showers on Thursday and Friday.

“Windier with rain in the northwest on Saturday, but mostly dry in the south.”

UK heatwave in pictures: Baking Britain cracks in hot weather

Baking Britain cracks as the hot weather continues.

As the to temperatures continue, Dr Thomas Waite of Public Health England said: "While many of us will be enjoying the hot weather over the next few days, for some it can pose a real health risk.

"So it is critically important that we keep an eye on friends, family and neighbours who may be at risk.

"To stay cool, avoid the sun during the hottest parts of the day, carry water with you when travelling and think what you can do stay cool when going to large events.

"It’s also worth remembering to think about practical steps to keep your home cool during the day as this can aid sleeping at night and give the body time to recover from the heat."

Leading bookmaker Coral has slashed odds to 1-4 that this summer goes on to become the hottest of all time.

Coral’s Harry Aitkenhead said: “1976 was the last summer to bring with it weather like we’ve had this year, but the heat so far has been sweltering and we now think this summer is almost nailed on to beat that record and go down as the hottest summer of all time.”